Hi All, 1] As you have yourself mentioned Graceful-Restart means that the peer will keep the Routes and keep forwarding the packets to the neighbor .....................But you have to remember that this neighbor which has gone down is undergoing a "SSO [Stateful Switch Over] between its Route-processors" when its Live one crashes. 2] It is not that the entire Router has gone down, but only its Primary Route-Processor. So in case you lose electricity obviously the router is not going to forward anything [unless there is a Router Ghost in there [IMAGE]].
Desmond Black, In Pursuit of CCIE!! India ----- Original Message ----- From: "Bryan Bartik" To: "Taqdir Singh" Cc: [email protected] Subject: Re: [OSL | CCIE_RS] Gracefull Restart Date: Sat, 15 Aug 2009 15:01:07 -0600 Taqdir, One example is where the primary RP crashes and the backup RP takes over. Several documents on cisco.com explain graceful restart and non-stop forwarding for the various protocols that support it. Take a look at the High Availability guide: http://www.cisco.com/en/US/docs/ios/ha/configuration/guide/12_2sr/ha_12_2sr_book.html On Sat, Aug 15, 2009 at 2:47 PM, Taqdir Singh <[email protected]> wrote: Thanks adrian , but what kind of go down it keeps the packet forwarding ? Sincerely, Taqdir Singh 91-9911709496 Do today what others won't, So that you can live tomorrow what others can't ---------------------------------------------------------------- From: Adrian Brayton <[email protected]> To: Taqdir Singh <[email protected]> Cc: [email protected] Sent: Saturday, 15 August, 2009 8:31:40 PM Subject: Re: [OSL | CCIE_RS] Gracefull Restart It doesn't really go down as you would think if you powered it off... It continues to forward packets using hardware and what's currently in the RIB. HTHs On Aug 15, 2009, at 3:34 PM, Taqdir Singh wrote: Books say in gracefull restart , if there are two neighbors.. the router which is going down will send a gracefull msg to its peer and that peer will not alter its routing table for specific period of time and will continue forwarding packets to router which is going down. and when the router which went down comes up will take all the routes from its peer router. I have confusion , if the router is going down how will it forward packets coming from the peer ? Could any1 clear the concept of gracefull restart , with a simple example of two routers , I would be very thankfull ? Sincerely, Taqdir Singh 91-9911709496 Do today what others won't, So that you can live tomorrow what others can't ------------------------------------------------------------ Yahoo! recommends that you upgrade to the new and safer Internet Explorer 8._______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com ---------------------------------------------------------------- Yahoo! recommends that you upgrade to the new and safer Internet Explorer 8. _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com -- Bryan Bartik CCIE #23707 (R&S), CCNP Sr. Support Engineer - IPexpert, Inc. URL: http://www.IPexpert.com _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com -- Be Yourself @ mail.com! Choose From 200+ Email Addresses Get a Free Account at www.mail.com!
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